长江干流上海段水质监测状况分析

根据2010~2011年长江干流上海段4次水质调查资料，研究了该区域长江水体中溶解氧、高锰酸盐指数、氨氮以及重金属含量在丰水期和枯水期两季的变化规律。结果表明：随季节性径流量变化，枯水期水体中各项污染指标含量较高，丰水期时则较低；受支流污染物汇入影响，支流汇入点下游的监测点污染水平较高；同时沿江不定期和不定量的污染物排放也会对水体中污染物浓度造成影响。此外，受较小流量和海水顶托作用的影响，长江入海口水体中各污染物浓度较高。

Water quality monitoring on Shanghai reach of Yangtze River

According to 4 time investigations on the water quality in Shanghai reach of the mainstream of Yangtze River form 2010 to 2011,the variation law of some pollution indexes is obtained in dry season and flood season,including dissolved oxygen,index of permanganate,ammonia nitrogen and heavy metal contents.The results show that,varying with the seasonal discharge,the pollution indexes are usually higher in dry season and lower in flood season;affected by pollutants from tributaries,the pollution level at the downstream of confluence point is higher;the pollutant concentration is affected by irregular pollutant discharge along the Yangtze River.The pollutant concentration in the estuary is also higher because of small flow discharge and sea water jacking.